1 files changed, 61 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cache.c b/src/mesa/state_tracker/st_cache.c
new file mode 100644
index 0000000000..0205b1cab3
--- /dev/null
+++ b/src/mesa/state_tracker/st_cache.c
@@ -0,0 +1,61 @@
+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+ /*
+  * Authors:
+  *   Zack Rusin <zack@tungstengraphics.com>
+  */
+
+#include "st_cache.h"
+
+#include "st_context.h"
+
+#include "pipe/p_state.h"
+
+#include "cso_cache/cso_cache.h"
+#include "cso_cache/cso_hash.h"
+
+/* This function will either find the state of the given template
+ * in the cache or it will create a new state state from the given
+ * template, will insert it in the cache and return it.
+ */
+struct pipe_blend_state * st_cached_blend_state(
+   struct st_context *st,
+   const struct pipe_blend_state *blend)
+{
+   unsigned hash_key = cso_construct_key((void*)blend, sizeof(struct pipe_blend_state));
+   struct cso_hash_iter iter = cso_find_state_template(st->cache,
+                                                       hash_key, CSO_BLEND,
+                                                       (void*)blend);
+   if (cso_hash_iter_is_null(iter)) {
+      const struct pipe_blend_state *created_state = st->pipe->create_blend_state(
+         st->pipe, blend);
+      iter = cso_insert_state(st->cache, hash_key, CSO_BLEND,
+                              (void*)created_state);
+   }
+   return (struct pipe_blend_state*)(cso_hash_iter_data(iter));
+}